The falling trees on covered-conductor (CC) overhead distribution lines produce partial discharges (PDs). The measurements have been taken in the laboratory and PD signal characteristics under various circumstances have been described. In this paper, an on-line single-phase PD monitoring system using Rogowski coil is simulated in EMTP-ATP. The simulation results are compared with those obtained from the laboratory measurements. The proposed model can be used to estimate the length of the practical CC lines at which PDs due to falling trees can be detected and localized; thus, deciding the number and positioning of the sensors over a particular length of the CC lines. The different noise sources have been described that cause interference with low level PD signals, which is a major challenge for on-line/on-site condition monitoring. The design aspects of the wireless sensor for this specific application are also discussed. Automatic detection of falling trees will reduce visual inspection work after storms and it will improve reliability and safety of the CC distribution system.
In this paper, the wave propagation characteristics of such studies are generally carried out at high frequencies, up to single-phase medium voltage (MV) cross-linked polyethylene about 100 MHz, by sending pulses or signals from a point, (XLPE) cable are determined using Time Domain Reflectometry which then travel through the conductor that essentially acts as (TDR) measurement technique. TDR delivers the complex propagation constant (attenuation and phase constants) of lossy a transmission medium. The incident and the reflected signals cable transmission line as a function of frequency. The frequency-are analyzed. These signals are distorted or changed in one dependent propagation velocity is also determined from the TDR way or the other by the transmission medium, and the measurements through the parameters extraction procedure. The reconstruction techniques are applied to get the desired wave TDR measurement results for MV XLPE cable and covered-.. .conductor (CC) overhead line are compared and it is proved that propagaion characteristcs (propagation constant; attenuation CC line has lower attenuation and higher propagation velocity and phase constants, and propagation velocity) from the than power cable. The measurement results can be used to measurements. Frequency and time domain techniques are localize the discontinuities in XLPE power cables and for PD used, hence, the need for understanding basic electromagnetic detection to monitor falling trees on the MV CC overhead lines. theories and their practical applications is prerequisite [4,5].Any signal will loose some of its energy or signal strength as
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